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UNITED l STAT-ns PATENT C)FFICE.

ELIAS C. ATKINS, OF INDIANAPOLIS, INDIANA.

MACHINE ,FOR DIPPING SAWS.

SPECIFICATION forming part .of Letters- Patent No. 294,346, dated March4, 1884.

Application filed October 1T, 1883. (No model.)

ceive the saw, when hot, in a horizontal posi-` tion, to clamp the sawon each side in such a manner as to hold it true and fiat and admit ofthe hardening-Huid coming in contact with all parts of the saw, to turnthe saw, while so held, from a horizontal to a vertical position,

- and to immerse the saw edgewise quickly in the hardening-bath, andtowithdraw it easily therefrom. I

The accompanying drawings illustrate myl invention.

Figure l is a side elevation with a portion broken away, showing theclamping-disks in a horizontal position. Fig. 2 is front elevation,showing theclampingldisks inclosing the saw and turned to a verticalposition. Fig. 3 is an enlarged vertical section on the line a a. Fig. 4is a partial rear elevation, showing a brake for controlling the descentof the saw into the hardeningbath. Fig.,5 is a partial section of theclamping-disks.

Like letters indicate the same parts.

b is a circular skeleton disk of cast-iron, formed with a seriesofparallel bars running across the disk, with open spaces between. Saiddisk is suspended on trunnions project-` ing outward from opposite edgesof the-diskf and journaled in bearings on a sliding rectangular frame,c. Segmental gear-wheels d. e are secured to disk b-one on eachside-concentric with the trunnions on which said disk is suspended. Ashaft, f, mounted in bearings secured to sliding frame c, carries ateach end toothed pinionslg g, which intermesh with the segmental gears de. One end of shaft f Vprojects beyond its bearing, and is squared tofit a corresponding socket in the end of a crank-shaft, h, mounted inbearings secured to the main frame A. Said shaft is adapted to have alimited longitudinal movement in its bearings, for the purpose ofengagingwith anddisengaging from the squared end of shaft f.

t' is a circular disk, of the same size and construction as disk b. Theworking-faces of disks b and i are studded with slight narrowprojections, as seen in Fig. 1, and these projections are faced off toform true parallel surfaces, between which the saw is grasped and held,as hereinafter explained. Disk t' is suspended above disk b,with theparallel bars of which it is formed crossing those of disk b at rightangles by means of a lever, j, link 7c, and arm Z, there being one ofeach on opposite edges of the'disk,'as shown. Lever j is pivoted atoneend to the edge of disk z', and is fulcrumed on link k, which' is inturn pivoted at its lower end to the edge of disk b. By thisarrangement, when the long arm o f lever j' is depressed, disk i israised away from disk b, in which position it is sustained by a pin at'm in the lever, engaging a hole in arm l, which is -rigidly secured todisk b.

For the purpose of guiding disk z' and keeping it in proper relation todisk b', steady-pins at u n are secured to disk 'i and pass throughholes in disk b. For the purpose Vof holding disk i closely against diskb when in a vertical position, eccentric guide-bars, like o, are securedone to each side of sliding frame c, in such a position as to impi'ngeagainst a friction-roller, p, secured to the top of disk t'. Thearrangement of the guide-bars, and their relation to the trunnions onwhich disk b turns, is such that the disks may be widely separated whenin a horizontal position; but as they are 'turned to .a verticalposition disk i is forced toward disk b by the contact of rollers p withthe inner surface of bars 0. For the purpose of holding the sawconcentric with disks b and t', and also to prevent it fromslipping frombetween the disks as they are turned from a horizontal to a verticalposition, a pin, g, having a rack, o", formed on its upper portion, isarranged to slide vertically in a central hole in disk t', and to passthrough the mandrel-hole in the saw and a central hole in disk b. Saidpin is raised and -lowered by means of a pinion, s,'which is journaledin a projection from disk z', and intermeshes with the rack teeth in pinq. Said pinion is mounted on a short shaft, to which is secured a lever,t, and the pin is operated by turning -Ioo said lever from side to side.Frame c is adapted to slide vertically on ways a u, secured to mainframe A. Said frame c and the disks, with their working mechanism, arenearly counterpoised by a weight, c, sufficient preponderance of weightbeing allowed to the frame and disks and their attachments, includingthe saw, when in position, to carry them by force of gravitation downinto the tank B, which is nearly filled with oil or other liquid,forming a hardening-bath.

w is a windlass, to which a rope, 2, is attached for raising the frame cfrom the hardening-bath.

:v is a bolt or sliding stop, operated by means of lever y. engages aprojecting pin secured in 'frame c, and holds the frame up. To preventframe c from moving down too rapidly when carrying a large saw, a brake,C, Fig. 4, is secured to frame A, and impinges against a flange on framec, being operated by means of lever 3.

rlhe operation of my machine is as follows:

Disks b and/i lying in a horizontal position g and separated by means oflevers y', as before explained, as seen in Fig. l, the saw is drawn fromthe furnace (represented in dotted lines) onto disk b, its positionthereon being determined by thrusting pin q through the hole in thecenter of the saw, by means of lever t and pinion s. Levers j are nowreleased from the arms Z, and diskfi falls and closes down on the saw.Crank-shaft h is now slid inward, so as to engage with shaft f, and asshaft f is revolved the disks, carrying the saw between them, are turnedto a vertical position, as shown in Fig. 2. The eccentric guides g, ofwhich there are two-one on each side ot' frame c'-- force the disksclosely together, thus straightening` the saw and holding it firmly inshape. Crank-shaftfis now withdrawn from shaft j", and boltzl,1withdrawn. Frame c. carrying the disks and the saw, now slides byforceof gravitation down ways a into the tank B, thus immersing the sawedgewise in the hardeningbath, which flows freely through the open-workof the disks, and the saw is evenly hardened throughout without warping.Frame c is now raised, by means of windlass w, to its formerposition,and the disks returned to ahorizontal position and separated,as at first, and the saw removed.

I claim as my invention- Vhen thrown inward, said bolt' between them andmounted on trunnions in a vertically-sliding frame; means for separatingand for forcing together said disks; a frame mounted on vertical waysand adapted to slide thereon; means for turning said disks from ahorizontal to a vertical position in said frame; a tank containingliquid and adapted to receive said frame and disks, and means forraising and lowering said sliding frame and disks, all combined andarranged to co-operate substantially as and for the purpose specified.

2. In a machine for dipping saws, the combination of a frame mounted onvertical ways and adapted to slide thereon and a pair of skeleton disksmounted in said frame and adapted to clamp a saw-plate between them andto turn from a horizontal to avertical position in said frame, allsubstantially as specified.

3. In a machine for dipping saws, the combination, with a verticalsliding frame and a pair of disks, one of which is pivoted to said frameand the other movable therein, of a pair of clamp'ing-bars secured tosaid frame eccentrically to the pivots on which said disk is mounted,and friction-rolls secured to said movable disk so as to come in contactwith said bars, whereby said disks are clamped together when turned to avertical position, substantially as specified.

l. The combination, with disks b and z', of center-pin q, having racki', pinion s, and means for turning said pinion, all arrangedsubstantially as and for the purpose specified.

5. rlhe combination,with sliding framcc and disk I), pivoted thereto, ofsegment-gears d c,

secured to said disk, shaft f, mounted in bea-rings on said frame,pinions g g, and means for turning shaft f, all substantially as and forthe purpose specified.

(i. The combination,with disks b and i, pivf oted in sliding frame e,segment-gears d e, pinions f/ g, and shaft f, of the detachablecrank-shaft h, mounted in bearings on frame A, for the purpose setforth.

nLIAs c. ATKINs.'

Vitnesses:

H. I. Hoon, E. E. SICKLER.

IOO

